Missing include bits c config h when cross compiling 64 bit program on 32 bit in Ubuntu

Question

I am running the 32bit version of Ubuntu 10 10 and trying to cross compile to a 64 bit target  Based on my research  I have installed the g  -multilib package   The program is a very simple hello world    include  lt iostream gt   int main  int argc  char   argv       std  cout  lt  lt   hello world   lt  lt  std  endl    return 0      Compile   g   -m64 main cpp   Error   In file included from main cpp 1   usr include c   4 4 iostream 39  fatal error  bits c  config h  No such file or directory compilation terminated    I have found a c  config h file but they reside under the i486-linux-gnu and i686-linux-gnu directories in  usr include c   4 4  There is not c  config h in  usr include c   bits   Any ideas on what I am missing  Compiling without the -m64 flag works fine  a out is created and runs correctly    Edit Thanks to the hint from  nightcracker  I did a little more investigation into the include structure on the 32 and 64 bit systems  I have added an answer below that  fixes  the problem temporarily but I think it will break on the next update  Basically  I am missing a directory called  usr include c   4 4 i686-linux-gnu 64 that should contain a subdirectory called bits that has the missing include file  Any idea what package should be taking care of this

User · Answer

This bug is fixed in  gcc-4 6    https   bugs launchpad net ubuntu  source gcc-4 5  bug 793411

User · Answer

On my 64 bit system I noticed that the following directory existed    usr include c   4 4 x86 64-linux-gnu 32 bits   It would then make sense that on my 32 bit system that had been setup for 64bit cross compiling there should be a corresponding directory like    usr include c   4 4 i686-linux-gnu 64 bits   I double checked and this directory did not exist  Running g   with the verbose parameter showed that the compiler was actually looking for something in this location   jesse shalored   projects test  g   -v -m64 main cpp  Using built-in specs  Target  i686-linux-gnu Configured with     src configure -v --with-pkgversion  Ubuntu Linaro 4 4 4-14ubuntu5  --with-bugurl file    usr share doc gcc-4 4 README Bugs --enable-languages c c   fortran objc obj-c   --prefix  usr --program-suffix -4 4 --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir  usr lib --without-included-gettext --enable-threads posix --with-gxx-include-dir  usr include c   4 4 --libdir  usr lib --enable-nls --with-sysroot   --enable-clocale gnu --enable-libstdcxx-debug --enable-objc-gc --enable-targets all --disable-werror --with-arch-32 i686 --with-tune generic --enable-checking release --build i686-linux-gnu --host i686-linux-gnu --target i686-linux-gnu Thread model  posix gcc version 4 4 5  Ubuntu Linaro 4 4 4-14ubuntu5   COLLECT GCC OPTIONS  -v   -m64   -shared-libgcc   -mtune generic    usr lib gcc i686-linux-gnu 4 4 5 cc1plus -quiet -v -imultilib 64 -D GNU SOURCE main cpp -D FORTIFY SOURCE 2 -quiet -dumpbase main cpp -m64 -mtune generic -auxbase main -version -fstack-protector -o  tmp ccMvIfFH s ignoring nonexistent directory   usr include c   4 4 i686-linux-gnu 64  ignoring nonexistent directory   usr local include x86 64-linux-gnu  ignoring nonexistent directory   usr lib gcc i686-linux-gnu 4 4 5             i686-linux-gnu include   include       search starts here   include  lt     gt  search starts here    usr include c   4 4   usr include c   4 4 backward   usr local include   usr lib gcc i686-linux-gnu 4 4 5 include   usr lib gcc i686-linux-gnu 4 4 5 include-fixed   usr include x86 64-linux-gnu   usr include End of search list  GNU C    Ubuntu Linaro 4 4 4-14ubuntu5  version 4 4 5  i686-linux-gnu      compiled by GNU C version 4 4 5  GMP version 4 3 2  MPFR version 3 0 0-p3  GGC heuristics  --param ggc-min-expand 98 --param ggc-min-heapsize 128197 Compiler executable checksum  1fe36891f4a5f71e4a498e712867261c In file included from main cpp 1   usr include c   4 4 iostream 39  fatal error  bits c  config h  No such file or directory compilation terminated    The error regarding the ignoring nonexistent directory was the clue  Unfortunately  I still don t know what package I need to install to have this directory show up so I just copied the  usr include c   4 4 x86 64-linux-gnu bits directory from my 64 bit machine to  usr include c   4 4 i686-linux-gnu 64 bits on my 32 machine   Now compiling with just the -m64 works correctly  The major drawback is that this is still not the correct way to do things and I am guessing the next time Update Manager installs and update to g   things may break

User · Answer

Did you try adding -I usr include c   4 4 i486-linux-gnu or -I usr include c   4 4 i686-linux-gnu

User · Answer

While compiling in RHEL 6 2  x86 64   I installed both 32bit and 64bit libstdc  -dev packages  but I had the  c  config h no such file or directory  problem   Resolution   The directory  usr include c   4 4 6 x86 64-redhat-linux was missing   I did the following   cd  usr include c   4 4 6  mkdir x86 64-redhat-linux cd x86 64-redhat-linux ln -s    i686-redhat-linux 32   I m now able to compile 32bit binaries on a 64bit OS

User · Answer

Seems to be a typo error in that package of gcc  The solution   mv  usr include c   4 x i486-linux-gnu  usr include c   4 x i686-linux-gnu 64

User · Answer

Basically It is used in HeapOverflows or other reversing type Problems i e  If you want to change a 64 bit ELF to 32 bit ELF and it is showing error while converting   You can simply run the commands  apt-get install gcc-multilib g  -multilib   which will update your libraries Packages upgraded      The following additional packages will be installed      g  -8-multilib gcc-8-multilib lib32asan5 lib32atomic1 lib32gcc-8-dev     lib32gomp1 lib32itm1 lib32mpx2 lib32quadmath0 lib32stdc  -8-dev     lib32ubsan1 libc-dev-bin libc6 libc6-dbg libc6-dev libc6-dev-i386     libc6-dev-x32 libc6-i386 libc6-x32 libx32asan5 libx32atomic1     libx32gcc-8-dev libx32gcc1 libx32gomp1 libx32itm1 libx32quadmath0     libx32stdc  -8-dev libx32stdc  6 libx32ubsan1   Suggested packages      lib32stdc  6-8-dbg libx32stdc  6-8-dbg glibc-doc   The following NEW packages will be installed      g  -8-multilib g  -multilib gcc-8-multilib gcc-multilib lib32asan5     lib32atomic1 lib32gcc-8-dev lib32gomp1 lib32itm1 lib32mpx2     lib32quadmath0 lib32stdc  -8-dev lib32ubsan1 libc6-dev-i386     libc6-dev-x32 libc6-x32 libx32asan5 libx32atomic1 libx32gcc-8-dev     libx32gcc1 libx32gomp1 libx32itm1 libx32quadmath0 libx32stdc  -8-dev     libx32stdc  6 libx32ubsan1   similar to this will be shown to your terminal

User · Answer

From my experience  sudo apt-get install gcc-multilib g  -multilib helps  But my another issue is that I FORGET to clean the directory so I still get the same error  It is the first time to use clang or cmake  So I just delete my original directory and re-compile and it works  Hope it helps someone like me

User · Answer

Adding this answer partially because it fixed my problem of the same issue and so I can bookmark this question myself   I was able to fix it by doing the following   sudo apt-get install gcc-multilib g  -multilib   If you ve installed a version of gcc   g   that doesn t ship by default  such as g  -4 8 on lucid  you ll want to match the version as well   sudo apt-get install gcc-4 8-multilib g  -4 8-multilib

[ubuntu] Missing include "bits/c++config.h" when cross compiling 64 bit program on 32 bit in Ubuntu

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